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Z80 and SIO board running

   I have my S-100 Z80 board running with the Serial-IO in a very
rudimentary fashion. These are the only 2 S100 boards I have at the
moment and they are running in a old compupro case. I wrote test
program that sends 'Hi!' to the serial port on reset and then echos
back any character typed on the terminal. If the character is an 'A',
diode A16 lights on the cpu otherwise A17 lights. Next board will be
EPROM/RAM board.